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I’ve updated the main thread with today’s progress. It’s slowly coming together.
Enjoy! 
This is really interesting. I’m going to learn a lot from this. 
Looking good relic. You working on it tomorrow?
Ver y interesting, looking forward to seeing it finished, very good job
flatten another piece like you did to close off that end, cut 2 circles that fit inside the tube, clamp em together and bore holes for the cells, then unclamp em and clean em up, solder them with the rest of the solder job at 1/3 and 2/3 inside the tube to hold the cells in place? (a disc of copper with 3 20mm holes in it) Not only would it hold the cells, it would make the battery tube area almost crush proof!
Very cool, can’t wait to see this one all tied up and polished!
Since this is a large piece, you could solder one end and then put that end in a little water and solder the other end. If the torch can get the one end hot quickly enough, you can solder one end, while the other end is in water. Kind of like plumbers that have to solder a copper pipe while there's water in the pipe. I have also done it by sitting one end on a folded up, soaking wet towel.
Whats this youre building, an SRK - Plumbers Edition? That should look great once its completed and polished.
Wow, nifty idea here! Can’t wait to see the final product.
Kinda looks like a slightly smaller copper BTU Shocker!
I didn’t think of that, it does look a bit like the Shocker. 
Happy Canada Day!
I have added some more updates from the weekend. Some very good progress I’d say. Hopefully I will get this done soon because I’ll have no time next weekend and then this contest wraps up. 
Very clever solutions to some tricky problems. How many watts will this hand warmer be?
Damn amazing, especially without CNC
Thanks everyone!
I’m planning for 2.8A/emitter, so yes, probably quite the hand warmer
I have no idea what you are talking aboot. 
First post updated. I got the emitters mounted now. YAY! getting closer.
Nice fingerprint…
Glad you like it.
That’s just the one you can see. They will not be there long. Dish soap and warm water, followed by a good rinse and some compressed air. Good as new.